These designer prescription glasses are made to accommodate most prescription lenses.Made of plastic, otherwise known as cellulose acetate, or zyl, the frame can be easily adjusted for a perfect fit with your prescription lenses. Your frame purchase includes free standard shipping charges, and manufacturer packaging. You can add doctor verified prescription lenses, add custom polarized lenses, and many other lens options if you desire them. Like all Aspex products, the Aspex PA-648 provides the sophisticated and classic look that we all need. Aspex PA-648 frames have a rectangle shape, which helps to balance rounded facial features. Frame shape is the most noticeable feature of a pair of glasses, followed by frame color and frame size. Top brands always have a large collection of rectangle frame shape glasses, as well as oval frame shape glasses.The frame has a Universal.Designed for adults, this model has a Spring type hinge for greater comfort.Standard skull temples can be easily adjusted to fit perfectly behind your ears. See all Aspex Aspex Glasses Brands: Easyclip, Takumi, and Easytwist Glasses Aspex Eyewear is a high quality maker of some of the world's most innovative, and patented, glasses brands. You can find them on our site by looking at the model numbers: Easyclip glasses begin with EC, Takumi glasses with TK, Easytwist glasses with ET. Easyclip glasses are known for their magnetic clip on sunglasses; Takumi glasses are known for the style and titanium frames; and Easytwist glasses are known for their incredible ability to be twisted in any direction. Aspex glasses are available in a variety of shapes, sizes, and colors. Aspex Eyewear glasses and Aspex Eyewear sunglasses can all be customized with prescription lenses, just like all of our glasses.